In 1939, Albert Einstein sent a letter to President Roosevelt informing him that “it may become possible to set up a nuclear chain reaction in a large mass of uranium” and that, using this technology, “it is conceivable—though much less certain that extremely powerful bombs of a new type may thus be constructed.” Einstein told FDR that Nazi Germany had already begun research, making it urgent that the U.S. start its own atomic program.

Citation: Ratnesar, R., Applegate, E., (December, 2014). The manhattan project,. Business Week, 4406, 106-107.

- Mike